Question

The following ERD and two tables represent a partial model similar to what we used in class. Answer all questions by writing SQL syntax to solve each. If a question requires more time, please move on to the next. Employee EmpNo (PK) Ename Job ManagerID HireDate Salary Commission DeptNo (FK) Department DeptNo Dname Location 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON Department DeptNo (PK) Dname Location 1400 Employee Monthly EmpNo Ename Job ManagerID HireDate Salary Commission DeptNo 7369 SMITH CLERK 7902 17-DEC-80 800 7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 7521 WARD SALESMAN 7698 22-Feb-81 1250 500 7566 JONES MANAGER 7839 02-APR-81 2975 7654 MARTIN SALESMAN 7698 28-SEP-81 1250 7698 BLAKE MANAGER 7839 01-MAY-81 2850 7782 CLARK MANAGER 7839 09-JUN-81 2450 7788 SCOTT ANALYST 7566 09-DEC-82 3000 7839 KING PRESIDENT 17-NOV-81 5000 7844 TURNER SALESMAN 7698 08-SEP-81 1500 7876 ADAMS CLERK 7788 12-JAN-83 1100 7900 JAMES CLERK 7698 03-DEC-01 950 7902 FORD ANALYST 7566 03-DEC-01 3000 7934 MILLER CLERK 7782 23-JAN-02 1300

Answer 1

1)

SELECT Job, COUNT(*) FROM Employee GROUP BY Job ORDER BY Job DESC;

2)

SELECT Ename, Job FROM Employee WHERE HireDate > '01/07/1980' ORDER BY Job;

3)

SELECT Ename FROM Employee WHERE ManagerID IS NULL;

4)

SELECT Ename FROM Employee WHERE Salary = (max(Salary) + min(Salary))/2;

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